// fig19_07.cpp 
// Controlling precision of floating-point values.
#include <iomanip>      
#include <iostream>
#include <cmath> 

int main() {
   double root2{std::sqrt(2.0)}; // calculate square root of 2

   std::cout << "Square root of 2 with precisions 0-9.\n"
      << "Precision set by ostream member function precision:\n";
   std::cout << std::fixed; // use fixed-point notation

   // display square root using ostream function precision
   for (int places{0}; places <= 9; ++places) {
      std::cout.precision(places);
      std::cout << root2 << "\n";
   } 

   std::cout << "\nPrecision set by stream manipulator setprecision:\n"; 

   // set precision for each digit, then display square root
   for (int places{0}; places <= 9; ++places) {
      std::cout << std::setprecision(places) << root2 << "\n";
   } 
} 




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